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nr rc L. F. MUNGER, OF ROCHESTER, NEW YORK.

LOCK.

Specification forming' part of Letters Patent No. 23,040, dated February22, 1859; Ressued December 12, 1871, No. 4,674. Y

To aZZ whom it may concern:

Be it known that I, L. F. MUNGER, of Rochester, in the county of Monroeand State of N ew York, have invented a new and Improved Lock; and I dohereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the annexed drawings,making a part of this specification, in which- Figure l, is a face orside View of my invention, the side of the case nearest the eye being'removed in order to show my invention. Fig. 2, is a sect-ion of ditto,taken in the line a", m, of Fig. l.

Similar letters of reference indicate corresponding parts in the twogures.

To enable those skilled in the art to fully understand and construct myinvention, I will proceed to describe it.

A, represents the case of the `lock which may be of rectangular form.

B, is the bolt which is fitted in the case A, and allowed to slidefreely back and forth therein, between guides a. The bolt is constructedsimilarly to those of most other locks, the cuter portion b, whichenters the nosing or recess in the stile or j amb of the casing beingthicker than the inner portion so that a shoulder c, is formed on thebolt.

C, represents a series of tumblers which are placed one over the otherin the same case A. These tumblers are placed transversely with the boltB, directly over it and work between the guides a, a, which have eachtwo sides exposed so that they may perform the same oilice for both thebolt and the tumblers, see Fig. 1. The tumblers are of skeleton form andeach is provided at one side with a recess or slot CZ, at the sideopposite the shoulder c, of the bolt. The lower ends of the tumblers aremade of semi-circular form, and against the upper end of each tumbler aspring e, bears, said spring having a tendency to keep the tumblersdepressed or pressed down to their fullest extent.

In the lower edge of the bolt B, a recess or notch f, is made and I), isan arbor which is fitted horizontally in the case A. This arbor has aknob E, attached to it at the outer side of the lock. rlhe portion ofthe arbor within the lock has two bits g, 7L, formed on it. These bitsproject from the arbor at opposite sides but they are in differentplanes, one g, adjoining the front plate z', of the lock and the otherl1., adjoining the back plate j, as shown clearly in Fig. 2.

The lower ends of the tumblers C, at the side have shoulders formed onthem, as shown at 7c, 701, Fig. l. The bit g,'acts alternately againstthese shoulders, as will be hereinafter referred to, and the bit Zz,fits or works in the recess or notch f, in the bolt B.

To the bolt B, just at the inner side of the shoulder c, a projection Z,is attached. rIhe inner side of this projection is serrated and also theouter sides of the tumblers C, for a short distance each side of theslots cZ.

At the upper end of each tumbler C, and at their outer sides, or sidesthat are nearest the part Z), of the bolt, there is :a projection m.These projections work behind a socket F, which is attached to one ofthe guides a, and is slotted to receive the key Gr, which is flat andquite thin. The key has its end notched as shown at a", said notchescorresponding in depth to the variable position of the notches d, in thetumblers. The slots CZ, of the tumblers C, are at varying distances inthe several tumblers, so that when they are acted upon by the springs e,only, the slots will not register with each other.

The operation is as follows: Suppose for instance the lock is in anunlocked state, and the key Gr, in the socket F, as shown in Fig. l. Inorder to thro-w the bolt B, and lock the lock, the knob E, is turnedfrom right to left, the projection Z, being allo-wed to pass through theslots CZ, in consequence of the same being in line, this effectbeing dueto the insertion of the key G, in the socket F. The bolt B, being shotoutward from the case A, the knob E, is still turned in the sainedirection, viz., from right to left, and the bit g, will act against theshoulder icl, of the tumblers O, and elevate the same, so that theprojections m, -will be raised from the key G, and the latter permittedto be removed from the socket F. When the key G, is removed from itssocket F, the springs c, throw down the tumblers O, and the slots cZ,will be thrown out of register and the lock will be in a locked state,as shown in red.

From the above description it will `be, seen that in order to unlock thelock, the slots d, of the tumblers C, must be made to register with eachother, in order to allow the projection Z, to pass through them, Toeffect Y this, the knob E, is turned from right to left and the bit g,will press against the shoulders 761, and elevate the tumblers. The keyG, is then inserted in the socket F, the knob E, turned in the reversedirection, viz., from left to right, and the springs e, throw thetumblers down, so that the project-ions m, of the tumblers will bearagainst the notched end of the key G, and the slots CZ, will be made, toregister with each other. The bit L, of the arbor D, then throws thebolt B, in the lock. The knob being still turned in the same direction,the bit g, will press against the shoulders 7c, the tumblers C, beingraised sutlieiently to allow the key G, to be withdrawn. rlhe springs c,throw down the tumblers C, as soon as the hand is removed from the knob,and the projection Z, of the bolt will be within chambers bx, in thetumblers, the slots (Z, requiring, of course, to be again brought intoregister before the bolt B, can be thrown out from the case.

By this arrangement of parts the lock is rendered extremely simple andstill all the advantages of the more complicated tumbler locks obtained.The tumblers require to be first raised before the key is inserted, andconsequently they cannot be tampered with by burglars, in order to gaina knowledge of the position of the slots cl,

with a view of constructing a suitable key to open the lock.

I am aware that sliding tumblers have been previously used, and also sawplate or thin flat keys, provided with notches of varying depths,corresponding with the varying positions of the slots in the tumblers. Itherefore do not claim separately the above parts, but

Having thus described my invention, what l claim as my invention anddesire to secure by Letters Patent, is-

The arrangement and combination of the knob E, with the tumblers C, andbolt B; the said knob having studs (g) and (it) out of line with eachother; one stud (h) being in line with the bolt, and the other stud (y)being in line with the tumblers; so that when the key Gr is inserted,one of the studs (g) shall pass by the tumblers while the bolt B is shotout by the other stud (71,), and when the key Gr is withdrawn, and thedirection of knob E reversed, the stud (g) shall lift the tumblers andthus prevent the picking of the lock by the insertion of a key, all asherein shown and described, for the purpose set forth.

L. F. MUNGER. Witnesses:

WM. C. SToRRs, CYRUS F. PAINE.

[Fmsr PRINTED 1910.]

